﻿using System;
using System.CodeDom;
using System.CodeDom.Compiler;
using System.Reflection;
using System.Security.Permissions;
using System.Web.Services.Description;
using System.Xml;

namespace GiaoDien
{
    class WSProxy
    {
        [SecurityPermissionAttribute(SecurityAction.Demand, Unrestricted = true)]
        public static object CallWebService(string webServiceAsmxUrl, string serviceName, string methodName, object[] args)
        {
            System.Net.WebClient client = new System.Net.WebClient();

            //-Connect To the web service

            System.IO.Stream stream = client.OpenRead(webServiceAsmxUrl + "?wsdl");

            //--Now read the WSDL file describing a service.

            ServiceDescription description = ServiceDescription.Read(stream);

            ///// LOAD THE DOM /////////

            //--Initialize a service description importer.

            ServiceDescriptionImporter importer = new ServiceDescriptionImporter();

            importer.ProtocolName = "Soap12"; // Use SOAP 1.2.

            importer.AddServiceDescription(description, null, null);

            //--Generate a proxy client.
            importer.Style = ServiceDescriptionImportStyle.Client;

            //--Generate properties to represent primitive values.

            importer.CodeGenerationOptions = System.Xml.Serialization.CodeGenerationOptions.GenerateProperties;

            //--Initialize a Code-DOM tree into which we will import the service.

            CodeNamespace nmspace = new CodeNamespace();

            CodeCompileUnit unit1 = new CodeCompileUnit();

            unit1.Namespaces.Add(nmspace);

            //--Import the service into the Code-DOM tree. This creates proxy code

            //--that uses the service.

            ServiceDescriptionImportWarnings warning = importer.Import(nmspace, unit1);

            if (warning == 0) //--If zero then we are good to go
            {

                //--Generate the proxy code
                CodeDomProvider provider1 = CodeDomProvider.CreateProvider("CSharp");

                //--Compile the assembly proxy with the appropriate references

                string[] assemblyReferences = new string[5] { "System.dll", "System.Web.Services.dll", "System.Web.dll", "System.Xml.dll", "System.Data.dll" };

                CompilerParameters parms = new CompilerParameters(assemblyReferences);

                CompilerResults results = provider1.CompileAssemblyFromDom(parms, unit1);

                //-Check For Errors

                if (results.Errors.Count > 0)
                {

                    foreach (CompilerError oops in results.Errors)
                    {

                        System.Diagnostics.Debug.WriteLine("========Compiler error============");

                        System.Diagnostics.Debug.WriteLine(oops.ErrorText);

                    }

                    throw new System.Exception("Compile Error Occured calling webservice. Check Debug ouput window.");

                }

                //--Finally, Invoke the web service method
                object wsvcClass = results.CompiledAssembly.CreateInstance(serviceName);

                MethodInfo mi = wsvcClass.GetType().GetMethod(methodName);

                return mi.Invoke(wsvcClass, args);

            }

            else
            {

                return null;

            }

        }

    }
}
